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參數資料
| 型號： | LM2678S-3.3X/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PSSO7 |
| 封裝： | TO-263, 7 PIN |
| 文件頁數： | 1/26頁 |
| 文件大小： | 670K |
| 代理商： | LM2678S-3.3X/NOPB |
May 1, 2008
LM2678
SIMPLE SWITCHER High Efficiency 5A Step-Down
Voltage Regulator
General Description
The LM2678 series of regulators are monolithic integrated
circuits which provide all of the active functions for a step-
down (buck) switching regulator capable of driving up to 5A
loads with excellent line and load regulation characteristics.
High efficiency (>90%) is obtained through the use of a low
ON-resistance DMOS power switch. The series consists of
fixed output voltages of 3.3V, 5V and 12V and an adjustable
output version.
The SIMPLE SWITCHER concept provides for a complete
design using a minimum number of external components. A
high fixed frequency oscillator (260KHz) allows the use of
physically smaller sized components. A family of standard in-
ductors for use with the LM2678 are available from several
manufacturers to greatly simplify the design process.
The LM2678 series also has built in thermal shutdown, cur-
rent limiting and an ON/OFF control input that can power
down the regulator to a low 50
μA quiescent current standby
condition. The output voltage is guaranteed to a ±2% toler-
ance. The clock frequency is controlled to within a ±11%
tolerance.
Features
■ Efficiency up to 92%
■ Simple and easy to design with (using off-the-shelf
external components)
■ 120 mΩ DMOS output switch
■ 3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
■ 50μA standby current when switched OFF
■ ±2%maximum output tolerance over full line and load
conditions
■ Wide input voltage range: 8V to 40V
■ 260 KHz fixed frequency internal oscillator
■ 40 to +125°C operating junction temperature range
Applications
■ Simple to design, high efficiency (>90%) step-down
switching regulators
■ Efficient system pre-regulator for linear voltage regulators
■ Battery chargers
Typical Application
10088603
SIMPLE SWITCHER is a registered trademark of National Semiconductor Corporation
2008 National Semiconductor Corporation
100886
www.national.com
LM2678
SIMPLE
SWITCHER
High
Efficiency
5A
Step-Down
Voltage
Regulator
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2678S-5.0 | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2678S-5.0/NOPB | 功能描述:直流/直流開關轉換器 HIGH EFF 5A STEP- DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2678S-5.0/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| LM2678SADJ | 制造商:Texas Instruments 功能描述: |
| LM2678S-ADJ | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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